1953?
1953 3104 pickup (all were "standard" bed in 1953)
Paint the front fenders separate from the cab/etc - fender welt is unpainted/black.
No fender welt with rear fenders.
People have speculated on this: most agree that the rear fenders were painted attached to the bed assembly (with bed boards not in place during the painting).
I paint the rear fenders off the bed and then put a piece of roofing felt between the rear fenders and the bed sides.